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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a5308f4540248fac7852e4135a8ed8ed93f7f567d5056c1b3e1358f3e8653c46' 
  AND token = 'ZA7Xt9a2Vo4H99TqIjepg2EbvVgb+Q/K9Tpzz68In48=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}